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Coin
4.0.3
Coin3D core library
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Coin
4.0.3
Coin3D core library
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The SoField class is the top-level abstract base class for fields. More...
#include <Inventor/fields/SoField.h>
Public Types | |
| enum | FieldType { NORMAL_FIELD = 0 , EVENTIN_FIELD , EVENTOUT_FIELD , EXPOSED_FIELD } |
Static Public Member Functions | |
| static void | cleanupClass (void) |
| static SoType | getClassTypeId (void) |
| static void | initClass (void) |
| static void | initClasses (void) |
Protected Member Functions | |
| SoField (void) | |
| virtual SoNotRec | createNotRec (SoBase *cont) |
| virtual void | evaluateConnection (void) const |
| SbBool | isDestructing (void) const |
| virtual SbBool | readConnection (SoInput *in) |
| virtual SbBool | readValue (SoInput *in)=0 |
| void | valueChanged (SbBool resetdefault=TRUE) |
| virtual void | writeConnection (SoOutput *out) const |
| virtual void | writeValue (SoOutput *out) const =0 |
The SoField class is the top-level abstract base class for fields.
Fields is the mechanism used throughout Coin for encapsulating basic data types to detect changes made to them, and to provide conversion, import and export facilities.
Almost all public properties in nodes are stored in fields, and so are the inputs and outputs of engines. So fields can be viewed as the major mechanism for scene graph nodes and engines to expose their public API.
Forcing data modification to go through a public function interface while hiding the data members makes it possible to automatically detect and react upon changes in the data structures set up by the application programmer.
E.g. the default behavior when changing the value of a field in a scene graph node is that there'll automatically be a chain of notifications – from the field to the owner node, from that node to its parent node, etc all the way through to the top-most root node, where the need for a rendering update will be signaled to the application.
(This notification mechanism is the underlying feature that makes the Coin library classify as a so-called data-driven scene graph API.
The practical consequences of this is that rendering and many other processing actions is default scheduled to only happen when something has changed in the retained data structures, making the Coin library under normal circumstances much less CPU intensive than so-called "application-driven" scene graph API, like for instance SGI IRIS Performer, which are continuously re-rendering even when nothing has changed in the data structures or with the camera viewport.)
Storing data members as fields also provides other conveniences for the application programmer:
realTime, providing a wall-clock timer.Note: there are some field classes which have been obsoleted from the Open Inventor API. They are: SoSFLong, SoSFULong, SoMFLong and SoMFULong. You should use these classes instead (respectively): SoSFInt32, SoSFUInt32, SoMFInt32 and SoMFUInt32.
For extending the Coin library with your own classes, we strongly recommend that you make yourself acquainted with the excellent «The Inventor Toolmaker» book (ISBN 0-201-62493-1), which describes the tasks involved in detail. This book was written by the original SGI Inventor designers and explains many of the underlying design ideas, as well as having lots of hands-on examples on how to extend the Coin toolkit in ways that are true to the fundamental design ideas. («The Inventor Toolmaker» is also available at SGI's online library, at no cost. See Download The Inventor Toolmaker.) Reading the source code of the built-in classes in Coin should also prove very helpful.
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Destructor. Disconnects ourself from any connected field or engine before we disconnect all auditors on the field.
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This is the base constructor for field classes. It takes care of doing the common parts of data initialization in fields.
| void SoField::addAuditor | ( | void * | f, |
| SoNotRec::Type | type ) |
Add an auditor to the list. All auditors will be notified whenever this field changes its value(s).
| SbBool SoField::appendConnection | ( | SoEngineOutput * | master, |
| SbBool | notnotify = FALSE ) |
Connect ourself as slave to another object, while still keeping the other connections currently in place.
| SbBool SoField::appendConnection | ( | SoField * | master, |
| SbBool | notnotify = FALSE ) |
Connect ourself as slave to another object, while still keeping the other connections currently in place.
This static method cleans up static data of the SoField class.
| SbBool SoField::connectFrom | ( | SoEngineOutput * | master, |
| SbBool | notnotify = FALSE, | ||
| SbBool | append = FALSE ) |
Connects this field as a slave to master. This means that the value of this field will be automatically updated when master is changed (as long as the connection also is enabled).
If this field had any master-relationships beforehand, these are all broken up if append is FALSE.
Call with notnotify if you want to avoid the initial notification of connected auditors (a.k.a. slaves).
Function will return TRUE unless:
FALSE.FALSE.| SbBool SoField::connectFrom | ( | SoField * | master, |
| SbBool | notnotify = FALSE, | ||
| SbBool | append = FALSE ) |
Connects this field as a slave to master. This means that the value of this field will be automatically updated when master is changed (as long as the connection also is enabled).
If this field had any connections to master fields beforehand, these are all broken up if append is FALSE.
Call with notnotify if you want to avoid the initial notification of connected auditors (a.k.a. slaves).
Function will return TRUE unless:
FALSE.FALSE.
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Called whenever another slave attaches or detaches itself to us. numconnections is the difference in number of connections made (i.e. if stuff is disconnected, numconnections will be a negative number).
The default method is empty. Override in subclasses if you want do something special on connections/disconnections.
If fromfield contains a connection to another field, make this field also use the same connection.
Copy value(s) from f into this field. f must be of the same type as this field.
Implemented in SoMFBitMask, SoMFBool, SoMFColor, SoMFColorRGBA, SoMFDouble, SoMFEngine, SoMFEnum, SoMFFloat, SoMFInt32, SoMFMatrix, SoMFName, SoMFNode, SoMFPath, SoMFPlane, SoMFRotation, SoMFShort, SoMFString, SoMFTime, SoMFUInt32, SoMFUShort, SoMFVec2b, SoMFVec2d, SoMFVec2f, SoMFVec2i32, SoMFVec2s, SoMFVec3b, SoMFVec3d, SoMFVec3f, SoMFVec3i32, SoMFVec3s, SoMFVec4b, SoMFVec4d, SoMFVec4f, SoMFVec4i32, SoMFVec4s, SoMFVec4ub, SoMFVec4ui32, SoMFVec4us, SoSFBitMask, SoSFBool, SoSFBox2d, SoSFBox2f, SoSFBox2i32, SoSFBox2s, SoSFBox3d, SoSFBox3f, SoSFBox3i32, SoSFBox3s, SoSFColor, SoSFColorRGBA, SoSFDouble, SoSFEngine, SoSFEnum, SoSFFloat, SoSFImage, SoSFImage3, SoSFInt32, SoSFMatrix, SoSFName, SoSFNode, SoSFPath, SoSFPlane, SoSFRotation, SoSFShort, SoSFString, SoSFTime, SoSFTrigger, SoSFUInt32, SoSFUShort, SoSFVec2b, SoSFVec2d, SoSFVec2f, SoSFVec2i32, SoSFVec2s, SoSFVec3b, SoSFVec3d, SoSFVec3f, SoSFVec3i32, SoSFVec3s, SoSFVec4b, SoSFVec4d, SoSFVec4f, SoSFVec4i32, SoSFVec4s, SoSFVec4ub, SoSFVec4ui32, and SoSFVec4us.
This method is called during the first pass of write operations, to count the number of write references to this field and to "forward" the reference counting operation to the field containers we're connected to.
| void SoField::disconnect | ( | SoEngineOutput * | master | ) |
Disconnect this field as a slave from master.
Disconnect all connections from this field as a slave to master fields or engine outputs.
| void SoField::enableConnection | ( | SbBool | flag | ) |
This sets a flag value which indicates whether or not the set up connection should be considered active. For as long as the "enable
connection" flag is FALSE, no value propagation will be done from any connected source field, engine or interpolator into this field.
If the connection is first disabled and then enabled again, the field will automatically be synchronized with any master field, engine or interpolator.
| SbBool SoField::enableNotify | ( | SbBool | on | ) |
This method sets whether notification will be propagated on changing the value of the field. The old value of the setting is returned.
Re-evaluates the value of this field any time a getValue() call is made and the field is marked dirty. This is done in this way to gain the advantages of having lazy evaluation.
If we're connected to a field/engine/interpolator, copy the value from the master source.
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This method is internally called after SoField::copyFrom() during scene graph copies, and should do the operations necessary for fixing up the field instance after it has gotten a new value.
The default method in the SoField superclass does nothing.
The application programmer should normally not need to consider this method, unless he constructs a complex field type which contains new references to container instances (i.e. nodes or engines). Overriding this method is then necessary to update the reference pointers, as they could have been duplicated during the copy operation.
Reimplemented in SoMFEngine, SoMFNode, SoMFPath, SoSFEngine, SoSFNode, and SoSFPath.
Returns the field's value as an ASCII string in the export data format for Inventor files.
Returns a unique type identifier for this field class.
| SbBool SoField::getConnectedEngine | ( | SoEngineOutput *& | master | ) | const |
Returns TRUE if we are connected as a slave to at least one engine. master will be set to the source of the last engine connection made.
| SbBool SoField::getConnectedField | ( | SoField *& | master | ) | const |
Returns TRUE if we are connected as a slave to at least one other field. master will be set to the source field in the last field connection made.
| int SoField::getConnections | ( | SoFieldList & | masterlist | ) | const |
Returns number of masters this field is connected to, and places pointers to all of them into masterlist.
Note that we replace the contents of masterlist, i.e. we're not appending new data.
| SoFieldContainer * SoField::getContainer | ( | void | ) | const |
Returns the SoFieldContainer object "owning" this field.
| SbBool SoField::getDirty | ( | void | ) | const |
Do we need re-evaluation?
| int SoField::getFieldType | ( | void | ) | const |
Return the type of this field.
| int SoField::getForwardConnections | ( | SoFieldList & | slavelist | ) | const |
Appends all the fields which are auditing this field in slavelist, and returns the number of fields which are our slaves.
| int SoField::getNumConnections | ( | void | ) | const |
Returns number of fields this field is a slave of.
Returns the type identification instance which uniquely identifies the Coin field class the object belongs to.
Implemented in SoMFBitMask, SoMFBool, SoMFColor, SoMFColorRGBA, SoMFDouble, SoMFEngine, SoMFEnum, SoMFFloat, SoMFInt32, SoMFMatrix, SoMFName, SoMFNode, SoMFPath, SoMFPlane, SoMFRotation, SoMFShort, SoMFString, SoMFTime, SoMFUInt32, SoMFUShort, SoMFVec2b, SoMFVec2d, SoMFVec2f, SoMFVec2i32, SoMFVec2s, SoMFVec3b, SoMFVec3d, SoMFVec3f, SoMFVec3i32, SoMFVec3s, SoMFVec4b, SoMFVec4d, SoMFVec4f, SoMFVec4i32, SoMFVec4s, SoMFVec4ub, SoMFVec4ui32, SoMFVec4us, SoSFBitMask, SoSFBool, SoSFBox2d, SoSFBox2f, SoSFBox2i32, SoSFBox2s, SoSFBox3d, SoSFBox3f, SoSFBox3i32, SoSFBox3s, SoSFColor, SoSFColorRGBA, SoSFDouble, SoSFEngine, SoSFEnum, SoSFFloat, SoSFImage, SoSFImage3, SoSFInt32, SoSFMatrix, SoSFName, SoSFNode, SoSFPath, SoSFPlane, SoSFRotation, SoSFShort, SoSFString, SoSFTime, SoSFTrigger, SoSFUInt32, SoSFUShort, SoSFVec2b, SoSFVec2d, SoSFVec2f, SoSFVec2i32, SoSFVec2s, SoSFVec3b, SoSFVec3d, SoSFVec3f, SoSFVec3i32, SoSFVec3s, SoSFVec4b, SoSFVec4d, SoSFVec4f, SoSFVec4i32, SoSFVec4s, SoSFVec4ub, SoSFVec4ui32, and SoSFVec4us.
Internal method called upon initialization of the library (from SoDB::init()) to set up the type system.
| SbBool SoField::isConnected | ( | void | ) | const |
Returns TRUE if we're connected from another field, engine or interpolator.
| SbBool SoField::isConnectedFromEngine | ( | void | ) | const |
Returns TRUE if we're connected from an engine.
| SbBool SoField::isConnectedFromField | ( | void | ) | const |
Returns TRUE if we're a slave of at least one field.
| SbBool SoField::isConnectionEnabled | ( | void | ) | const |
Return the current status of the connection enabled flag.
| SbBool SoField::isDefault | ( | void | ) | const |
Check if the field contains its default value. Fields which have their default value intact will normally not be included in the output when writing scene graphs out to a file, for instance.
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Can be used to check if a field is being destructed.
| SbBool SoField::isIgnored | ( | void | ) | const |
Returns the ignore flag.
| SbBool SoField::isNotifyEnabled | ( | void | ) | const |
This method returns whether notification of changes to the field value are propagated to the auditors.
Check if this instance is of a derived type or is the same type as the one given with the type parameter.
| SbBool SoField::isReadOnly | ( | void | ) | const |
Returns TRUE if this field should not be written into at the moment the method is called.
This method is used internally in Coin during notification and evaluation processes, and should normally not be of interest to the application programmer.
Check for equal type and value(s).
Implemented in SoMFBitMask, SoMFBool, SoMFColor, SoMFColorRGBA, SoMFDouble, SoMFEngine, SoMFEnum, SoMFFloat, SoMFInt32, SoMFMatrix, SoMFName, SoMFNode, SoMFPath, SoMFPlane, SoMFRotation, SoMFShort, SoMFString, SoMFTime, SoMFUInt32, SoMFUShort, SoMFVec2b, SoMFVec2d, SoMFVec2f, SoMFVec2i32, SoMFVec2s, SoMFVec3b, SoMFVec3d, SoMFVec3f, SoMFVec3i32, SoMFVec3s, SoMFVec4b, SoMFVec4d, SoMFVec4f, SoMFVec4i32, SoMFVec4s, SoMFVec4ub, SoMFVec4ui32, SoMFVec4us, SoSFBitMask, SoSFBool, SoSFBox2d, SoSFBox2f, SoSFBox2i32, SoSFBox2s, SoSFBox3d, SoSFBox3f, SoSFBox3i32, SoSFBox3s, SoSFColor, SoSFColorRGBA, SoSFDouble, SoSFEngine, SoSFEnum, SoSFFloat, SoSFImage, SoSFImage3, SoSFInt32, SoSFMatrix, SoSFName, SoSFNode, SoSFPath, SoSFPlane, SoSFRotation, SoSFShort, SoSFString, SoSFTime, SoSFTrigger, SoSFUInt32, SoSFUShort, SoSFVec2b, SoSFVec2d, SoSFVec2f, SoSFVec2i32, SoSFVec2s, SoSFVec3b, SoSFVec3d, SoSFVec3f, SoSFVec3i32, SoSFVec3s, SoSFVec4b, SoSFVec4d, SoSFVec4f, SoSFVec4i32, SoSFVec4s, SoSFVec4ub, SoSFVec4ui32, and SoSFVec4us.
Notify auditors that this field has changed.
Reimplemented in SoMFPath, SoSFPath, and SoSFTrigger.
Returns TRUE if the fields are of different type or have different value.
Checks for equality. Returns 0 if the fields are of different type or the field's value(s) are not equal.
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Read the master field of a field-to-field connection (and its field container).
If input parsing is successful, this field will be connected as a slave to the master field.
Note that this slave field will not be marked as "dirty" upon connection, i.e. it will retain its value until the first update of the master field is made after the connection was set up. This to be in conformance with how the Inventor Mentor specifies how field connections should be imported (see page 270).
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Read field value(s).
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Returns TRUE if this field has references to any containers in the scene graph which are also duplicated during the copy operation.
Note that this method only is valid to call during copy operations.
See also the note about the relevance of the fixCopy() method for application programmers, as it is applicable on this method as well.
Reimplemented in SoMFEngine, SoMFNode, SoMFPath, SoSFEngine, SoSFNode, and SoSFPath.
| void SoField::removeAuditor | ( | void * | f, |
| SoNotRec::Type | type ) |
Remove an auditor from the list.
| SbBool SoField::set | ( | const char * | valuestring | ) |
Set the field's value through the given valuestring. The format of the string must adhere to the ASCII format used in Coin data format files.
Only the value should be specified - not the name of the field.
FALSE is returned if the field value is invalid for the field type and can't be parsed in any sensible way.
| void SoField::setContainer | ( | SoFieldContainer * | cont | ) |
Let the field know to which container it belongs.
| void SoField::setDefault | ( | SbBool | def | ) |
Set whether or not this field should be marked as containing a default value.
| void SoField::setDirty | ( | SbBool | dirty | ) |
Mark field for re-evaluation (upon next read operation), but do not trigger a notification.
| void SoField::setFieldType | ( | int | type | ) |
Set type of this field.
The possible values for type is: 0 for ordinary fields, 1 for eventIn fields, 2 for eventOut fields, 3 for internal fields, 4 for VRML2 exposedField fields. There are also enum values in SoField.h.
| void SoField::setIgnored | ( | SbBool | ignore | ) |
Sets the flag which indicates whether or not the field should be ignored during certain operations.
The effect of this flag depends on what type of field it is used on, and the type of the node which includes the field.
This flag is represented in Inventor files by a ~ behind the field name. The flag is in other words persistent.
| SbBool SoField::shouldWrite | ( | void | ) | const |
Returns TRUE if it is necessary to write the field when dumping a scene graph. This needs to be done if the field is not default (it has been changed from its default value), if it is ignored, or if it is connected from another field or engine.
Trigger a notification sequence.
At the end of a notification sequence, all "immediate" sensors (i.e. sensors set up with a zero priority) are triggered.
Reimplemented in SoSFTrigger.
Notify the field as well as the field's owner / container that it has been changed.
Touching a field which is part of any component (engine or node) in a scene graph will lead to a forced redraw. This is useful if you have been doing several updates to the field wrapped in a pair of enableNotify() calls to notify the field's auditors that its value has changed.
Reimplemented in SoSFTrigger.
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This method is always called whenever the field's value has been changed by direct invocation of setValue() or some such. You should never call this method from anywhere in the code where the field value is being set through an evaluation of its connections.
If resetdefault is TRUE, the flag marking whether or not the field has its default value will be set to FALSE.
The method will also notify any auditors that the field's value has changed.
Write out information about this field's connection.
1.10.0